Refrigerating apparatus



H. B. HULL REFRIGERATING APPARATUS Aug. 1s, 1931.

Criginal FedAbil 30, 1925 @I Nimm \\\\\\\\\\\\\\\\n\\\\\\\\\\\\\\\\\\\\\\\\\\\wm\\\\\\ n N n M//neas es ,Inventor Harry/u/l.

Hfs Attorney Reissued Aug. 18, 1931 UNITED STATES PATENT ori-lea HARRY\B. HULL, OF DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

FRIGIDAIRE CORPORATION, A CORPORATION OF DELAWARE R-EFRIGERATING APPARATUS i Original No. 1,768,600, dated July led July 8, 1931.

One of the objects of the present invention is to render refrigerating apparatus operative 1n response to increase 1n temperature ina cooling chamber and to render 1t inoperatlve when the temperature has been reduced to a.` The disclosed form of the in-A certain extent. ventlon provides an electrlc switch for con'- `tro1ling a. motorvfor operating the refrigerating apparatus, the switch, ing opened bya spring and closed by the freezing of a body of liquid located in the cooling chamber. A l

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings,'wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings: i

Fig. 1 is a sectional view of a cabinet containing refrigerating apparat-us in which the present invention is associated; and

Fig. 2 is -a sectional view of the controller.

The present invention contemplates the use of a controller having a liquid reservoir, the controller being located in ak portion of the refrigerator which is cold enough to freeze the liquid to cause the expansion of same to operate a controller switch for an elect-ric mo- .tor used for driving-the compressor of the refrigerator.

Referring to the drawings, a refrigerator cabinet 20 is provided with a machine 4compartment base 21 on which a compressor and condenser 22 and an electric motor 23 for driving the same are carried. The compressor, condenser, and motor assembly is similar to that shown in the patent to Bechtold and hlellows. No. 1.276.612, patented August 20, 1918. The refrigerator also comprises a food compartment 25 and a brine tank compartment 26 insulated from the walls of the cabinet. The compartments 25 and 26 are scparated by a horizontal wall 27 and a vertical wall 28 each having inter-commuuicat-ing 'passages 29 and 30 respectively. A brine 1, 1930, fSerial No. 635,521, filed April 30,- 1923. Application for reissue Serial N0. 549,525. :L

tank cradle 32 is bolted to the refrigerating cabinet by bolts 33. Cradle 32 carries a brine tank 35. Refrigerant evaporator coils (not shown) are contained within the brine tank 35 and connected withan evaporating chamber 36. Refrigerant pipes 37 and 38 connect the evaporating chamber with the compressor 22 the pipe 37 being the highv pressure line through .which the refrigerant is pumped from the condenser to the evaporator chamber 36 and the pipe 38 bein the low pressure line through which the reigerant is drawn from the chamber 36 to the compressor.

The electricmotor is controlled by a controller 40. Controller 40 comprises a member vforming a reservoir or chamber 47 and a 48 to form a chamber 49. A diaphragm 50 forms a wall for the upper part o the chamber 49. Diaphragm 50 supports a plunger rod 51 extending through an adjustable bushing 52 screwed into an abutment 53. The abutment 53 and diaphragm 50 are secured in place by Screws 54. A spring 56 is interposed between the bushing-52 and the diaphragm 50 and normally bears downwardly against the diaphragm 50. Rod 51 is connected by a'link 57 with the controller rod 58vof the snap switch 42. Controller. rod 58 is provided with flanges 59 and 60 which are spaced and into which space the forked end 61 of the link 57 extends. Switch 42 carries a bracket 62 to which the link 57 is fulcrumed as at 63. Snap switch 42 is carried bythe bracket 41 and held in place by one of the lbolts 54 and bolt 64.

The reservoir 47 contains a quantity of water the upper level ofwhich is indicated at 65. The controller 4() is carried adjacent the brine tank 35 where the temperature is such that the liquid within the reservoir 47 y on the diaphra will freeze. The freezing of the liquid will cause same to expand and compress the air within the chamber 49. The Compressed air, or other medium in the chamber 49 acting 50 will bend sameupwardly causing t e rod 51 to actuate the conlevel 65.

67 in or out of the reservolr 47. The bolt 37- troller rod 58 through link 57 and thereby actuate the snap switch 42 to interrupt the Y circuit between wires43 and 44.

When lthe contents of the rservoir 47 are in a liquid state, the" spring 56 will have re turned the snap switch to closed position as shown in Fig. 2. Current will be supplied to the motor 23 throu h` the wires 43, snap switch 42, wire 44, on t e one side of the line andcby wire to'lthe other side of the line.

The motor 23 willthen drive the compressor 22 to draw refrigerant gas from the evaporator chambers 36 through the pipes 38 to cool the'brine tank and likewise brine compartment chamber 26 and food compartment chamber 25, the convectional current of air passing through the passages 29f-ard 30..

en a certain low temperature has been reached the liquid in the reservoir 47 will freeze again andvt-hereby cause the motor to cease operation. K

The tension of spring 56 Aupon the diaphragm is adjusted by turning the .bushlng 52. A cover is provided for the vcontxlling mechanism which is readily remova e. Y

Access may be had to the controller from the front of the refrigerator cabinet, `therefore the controller can be readily adjusted orrepaired. If desirable the entire controller can be removed by removing plug 46 and screws 41a. f

The pressure within the reservoir 47 can be varied b raisin or lowering the water is is one ,b screwing aybolt is locked into position by a. nut'68. Or if Ldesirable the bo t 67 can be omitted and water added or taken out as may be necessaryfor the correct operation ofthe switch. In this manner the range of response ofthe controlling apparatus to temperature changes i can be raised or lowered.

`While the shown and described constitutes a preferred -embodiment of one form of thel invention, it

is to be understood that other forms might be i adopted and various changes and alterations made in the shape, size, and proportion of the elements therein without departing from the spirit and scope of the invention.

What is claimed is as follows:

1. A control for refrigerating systems comprising a chamber containing a substance to be frozen, and a substance remaining in the gaseous. phase throughout the temperature cycle, said chamber comprising a flexible wall, and means suddenly responsive to expansion of the substance to be frozenv for controlling the operation of `the refrigerating system. l

2. A control for refrigerating systems comprising a chamber containing a substance to be frozen, and a substance remaining in the gaseous phase throughout the temperalture cycle, said'chamber comprising a ilexible wall, means suddenly responsive ,to expension of the substance to be frozen, and means to adjust the space within said chamber independently of the llexure of said flexible wall.

3. In combination means tending to assume suddenly one of two positions on either side of a neutral point and -means for urging 4said first named means from one point to the other comprising a container with a gas to remain in the gaseous phase'throughout the entire temperature cycle vof operation, and a substance. tending to change between the liquid and solid phases during said cycle.

4. A control for mechanical refrigerators comprising a Isnap switch, means for operatingV the switch and a gas cushioned substance freezing and melting within the temperature cycle of operation -of the refrigerator for moving such operating means. 'l

5. A mechanical refrigerating system adapted to operate in temperature cycles, and means for controlling the cycles including an enclosed liquid in the presence of a `permanently enclosed gas, said liquid being adapted to freeze and melt durin each cycle.

HARRY HULL.

form of mechanism herein sov ios 

